mpris: Ignore read-only MPRIS intstances
renderer: If media is not seekable, return 710

https://bugzilla.gnome.org/show_bug.cgi?id=710377
server: Use XML namespace instead of a string
server: Use base64url instead of base64

Encoded base64 uris may have '/' chars which cause issues in function
HTTPItemURI.from_string

https://bugzilla.gnome.org/show_bug.cgi?id=710877
renderer: Accept missing mime type in AVTransport.is_playlist()

"assertion 'mime != NULL' failed" is not useful here.

https://bugzilla.gnome.org/show_bug.cgi?id=711661
renderer: Add Next and Previous to CurrentTransportActions

https://bugzilla.gnome.org/show_bug.cgi?id=711661
Add milliseconds support in Rygel.TimeUtils time to string conversion

https://bugzilla.gnome.org/show_bug.cgi?id=711399

Conflicts:
	src/librygel-renderer/rygel-time-utils.vala
Prepare 0.20.2